Air-compressor



J. C. FREDRICKSEN. AIR COMPRESSOR.

APPLICATION FILED DEC. 2a. 1916.

1,3 1 0,471 Patented July 22, 1919.

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J. C. FREDRICKSEN.

AIR COMPRESSOR.

APPLICATION men 05c. 26. l9l6.

1,3 10,4? 1 Patented July 22, 1919.

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WITNESSES: JOHN C. TREHKIC/(J'F/V a (7 0d f'0fl7/M BY HIS A TTORNEY.

J. C. FREDRICKSEN.

AIR COMPRESSOR.

APPLICATION FILED DEC. 26. 1916.

1,3 1 0,471 Patented July 22, 1919;

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- INVEN TOR. WI TNESSES: JOHN .FREDRICKSEN.-

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UNITED sTATEs PATEN are JOIIN C. FREDRICKSEN, OF MILLER, INDIANA, ASSIGNOR 0F ONE-THIRD TO ALFRED T.

' THOMPSON, OF HAIMIMIOND, INDIANA.

AIR-COMPRESSOR.

Specification of Letters Patent.

Patented July 22, 1919 To all whom it may concern:

Be it known that I, JOHN C. FREDRICK- sun, a citizen of the United States, and a resident of Miller, county of Lake, and State of Indiana, have invented certain new and useful Improvements in Air-Compressors, of which the following is a specification. My invention relates to improvements in air compressors, and has for its object the provision of an improved construction of this character by means of which air may be compressed with great efliciency.

Another object of the invention is to provide an air compressor by means of which compressed air of different degrees of compression may be provided.

Another object of the invention is to provide an improved explosive engine cooperating with the compressor.

Other objects will appear hereinafter.

With these objects in view, the invention consists in the combinations and arrangements of parts hereinafter described and claimed.

The invention will be best understood by reference to the accompanying drawings forming a part of this specification, and in which,

Figure 1 is a side view shown partially in section of an air compressor embodying my invention,

Fig. 2, a vertical section of the same at right angles to Fig. 1,

Fig. 3, an enlarged horizontal section taken on line ww of Fig. 2,

Fig. 4, an enlarged horizontal section taken on line y-y of Fig. 2, and

Fig. 5, a side view of a modified form of construction.

The preferred form of construction, as illustrated in 1' to 4, inclusive, comprises a suitable base or pedestal 6 having an ordinary crank shaft 7 mounted therein and provided with two crank pins 8 connected by connecting rods 9 with the opposite ends of a cross bar or rod 10, as shown. Cross bar 10 is operatively connected centrally with a compound or double piston 11-12 operating in an explosive engine cylinder 13 positioned vertically on pedestal 6. The cross bar 10 also operates in bearing blocks 14 mounted to slide in slots 15 provided in the side walls of cylinder 13. An intake port 16 is provided at the extreme lower end of cylinder 13 and isconnectcd by means of a pipe 17, having an ordinary check valve 18 therein, with a suitable carbureter of any desired construct-ion (not shown). An outlet port 19 is also provided at the extreme lower end of cylinder 13 and connects with a by-pass pipe 20 having a ,check valve 18 therein and leading to an inlet port 21 located at the upper end of cylinder 13, adjacent the top thereof. By this arrangement, it will be observed, that explosive mixtures or charges will be drawn into the lower end of cylinder 13 by the actlon of piston 11-12, and forced into the upper. end of said cylinder. An air compressor cylinder 22 is arranged on top of cylinder 13 in vertical alinement therewith and a sealing plate 23 is interposed between said cylinder, said sealing plate being proyided with a plurality of restricted openlugs 24 connecting the adjoining ends of said cylinder. The sealing plate 23 is provided with an upwardly extending substantially cup-shaped projection 25 fitting within'the lower end of cylinder 22 and provided with a lateral port 26 leading to a spark plug 27 in the side of the lower end of cylinder 22, as indicated. A- weighted piston 28 is arranged to reciprocate freely and vertically in cylinder 22, said cylinder being provided centrally with combined exhaust and inlet ports 29 controlled by piston 28, as will be readily understood.

The upper end of cylinder 22 is also provided with a plurality of outlet ports 30, 31 and 32 communicating, respectively, with compressed air pipes 33, 34 and each equipped with a check valve 18. The constructlon is provided with any usual timing arrangement for providing periodical sparks from spark plug 27 to explode a compressed charge forced into the lower end of cylinder 22 at each operation of piston 11-12. Explosion of this charge causes elevation of piston 28 compressing the air in the upper end of cylinder 22, said compressed air escaping at different degrees of compression through the respective pipes 33,

.34 and 35, through which the same is led away to suitable storage tanks or for other purposes.

The uppermost port 32 is arranged some distance below the top of cylinder 22, so that a cushion or dash ot space 36 is novided at the top of cyllnder 32 to cus lion the upward motion of piston 28 and check the same without shock or jar. This also serves to compress the air in the space 36, the subsequent expansion of said air imparting power to the piston 28, whlch is subsequently utilized in compressing the charge in the lower end of the cylinder 22. At the limit of its upward movement, piston 28 uncovers the orts 29 permitting exhaust of the lower en of cylinder 22 and the upper end of cylinder 13, as will be readily understood. The downward movement f piston 28 serves to assist in the compression of the explosive charge, and at the limit of its downward movement, the ports 29 are uncovered to admit air to the upper end of cylinder 22. Upon upward motion of the piston 28, under the influence of the explosion in the lower end of the cylinder 22, the ports 29 are uncovered after an expansion of the explosive gases practically to atmospheric pressure, thus utilizing all of the available power enerated by the explosion. Suflicient force 0 the explosion is communicated through the openings 24 to the upper end of cylinder 13 to cause operation of the piston 11- 12 therein, to supply the requisite explosive charges, as required.

In the modified form of construction illustrated in Fig. 5, two of the units above described are arranged side by side and operated from the same crank shaft. In this arrangement, the construction of each separate unit is the same as the above outlined, the only difference being that the crank shaft 7 is provided with but a single crank shaft 8 connected by a single connecting rod 9 with a cross bar 10 which connects the pistons in both the adjoining cylinders 13,

tion. I, therefore, do not wish to be limited variations and modifications as come within the scope of the appended claims.

Having described my inventlon what I claim as new and desire to secure by Letters Patent is:

1. An air compressor comprising a vertically arranged cylinder having an inlet port; a weighted piston freely operating in said cylinder, there being iston controlled outlet orts in said cylin er; check valves controlling said ports; and pressure operating means for periodically elevating said piston, substantially as described.

2. An air compressor comprising a vertically arranged cylinder; a weighted piston freely operating in said cylinder, there beingpiston-controlled inlet and .outlet ports in said cylinder,'said outlet portsbeing located at different longitudinal positions in the walls of said cylinder; and means for periodically elevating said piston, substantially as described.

3. An air compressor comprising a vertically arranged cylinder; a weighted piston freely operating in said cylinder, there being piston controlled inlet and outlet ports in said cylinder, said outlet Ports being located at different longitudinal. positions in the walls of said cylin er; check valves controlling said outlet ports; and means for periodically elevating said piston, substantially as described.

4. An air compressor cylinder having a' suitable inlet port and piston controlled compressed air outlet ports arranged :at different longitudinal positions therein; a piston in said cylinder; and check valves controlling said outlet ports, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

' JOHN C. FREDRIOKSEN.

Witnesses:

JAcoB ZnLIBoR, .LOUIS ZELIBoR. 

